Push pull knob



FIG. 1 is a perspective view of my new push pull knob;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a perspective view of the push pull knob of FIG. 1 shown in a first example environment; and,

FIG. 8 is a perspective view of the push pull knob of FIG. 1 shown in a second example environment.

The portion of the push pull knob depicted in broken lines in FIGS. 1-6 and the environmental structures depicted in broken lines in FIGS. 7 and 8 are shown by way of example and form no part of the claimed design. 

The ornamental design for a push pull knob, as shown and described. 